Y=2X-7 ...........(1)
5X+3Y+2Z=2.......(2)
3X+4Z=4..............(3)
解:由(3)可得Z=1-0.75X (4)
将(1),(4)代入(2)
整理得X=24/19
将x=24/19代入(1)得y=-85/19
将x=24/19代入(4)得z=1/19
所以{x=24/19
{y=-85/19
{z=1/19
{y=2x-7……………………1
{5x+3y+2z=2………………2
{3x+4z=4……………………3
将方程1代入2得:11x+2z=23…………4
将4与5联立得:X=42/19 y= z=
即可求得